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In gears, interference takes place when

A. The tip of a tooth of a mating gear digs into the portion between base and root circles

B. Gears do not move smoothly in the absence of lubrication

C. Pitch of the gears is not same

D. Gear teeth are undercut

Please do not use chat terms. Example: avoid using "grt" instead of "great".

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  2. Which of the following statements regarding laws governing the friction between dry surfaces are correct?
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  15. When the two elements of a pair have __________ when in motion, it is said to a lower pair.
  16. In a simple harmonic motion, the velocity vector with respect to displacement vector
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